我国南方与北方的分界线是____ ．北方耕地类型是____ ，主要种植的粮食作物是____ ;南方耕地类型是____ ，主要种植的粮食作物是____.

托克维尔《论美国的民主》：“一个立宪君主的意见如遭到作为立法机构的两院的反对，他就不能进行统治，这在欧洲已成定论。但是大家知道，美国有好几位总统曾在立法机构失去多数，但并未被迫放弃权力，也未给社会造成严重的灾难。”材料主要表明

下图是中国居民“膳食平衡宝塔”，请据图回答问题。

（1）每天人摄取最多的食物应是含____ 较多的食物。
（2）每天人摄取最少的食物应是含____ 较多的食物。
（3）青少年正在成长发育，需要大量的蛋白质，因此需要多吃金字塔中第____ 、____ 类食物。
（4）高血压和高血脂的人应该尽量减少脂肪的摄入，因此在他们的饮食中应该少吃第____ 层的食物

   Mr. and Mrs. Clark are 70 years old. They look young and they are very healthy. Why? Let me tell you. That’s because they have a healthy lifestyle.
   They exercise every day, and every morning they exercise in the park. After that they usually go to the supermarket. They walk there for about half an hour. They don’t take buses. Because they think walking is good for their health. They often take a walk after dinner.
They also have a good eating habit. They drink milk every morning. They eat fruit and vegetables every day. As for meat, they only eat it twice a week. Besides (除…之外) that, they never eat junk food. They don’t drink coffee or cola at all. You see, they look after their health very well.
   Mrs. Clark likes watching soap operas and reading books. She reads books every day. Mr. Clark likes Chinese paintings. They usually go to bed at 9:00 pm and sleep for eight hours every night.